OHC Co-op Farming Unit Study
This is a free 227-page unit study from CurrClick. I'm not sure how long it'll be offered for free.
We live in a rural area and have been slowly adding to our own family farm. So far we have chickens and ducks. We're currently testing the soil to see if our land will sustain a fruit orchard. So, this unit is of particular interest to us.
It's geared for pre- to grade school but the list of links will be helpful to older children. If anyone knows of a good, free unit for middle to high school please leave a comment below.